Forecast sensitivity to satellite observations at Météo-France [poster]
Saint-Ramond, Nathalie ; Doerenbecher, Alexis ; Rabier, Florence ; Guidard, Vincent
The IASI instrument is assimilated at many operational meteorological centres, mainly in clear conditions, providing a significant positive impact on the forecast skill. However, more than 80% on the whole globe is covered by clouds. All the centres have begun to handle the cloudy data in recent years, starting with the assimilation of cloud-affected radiances with simple assumptions, only considering the absorption effects of the clouds and consequently for very restricted conditions as overcast opaque single layers. The use of fast radiative transfer models, including the scattering and absorption effects of clouds, are a relevant challenge for the next years, in order to increase the amount of cloudy radiances in data assimilation.
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